|1.||a. the return of part of the output of an electronic circuit, device, or mechanical system to its input, so modifying its characteristics. In negative feedback a rise in output energy reduces the input energy; in positive feedback an increase in output energy reinforces the input energy|
|b. that part of the output signal fed back into the input|
|2.||the return of part of the sound output by a loudspeaker to the microphone or pick-up so that a high-pitched whistle is produced|
|3.||the whistling noise so produced|
|4.||a. the effect of the product of a biological pathway on the rate of an earlier step in that pathway|
|b. the substance or reaction causing such an effect, such as the release of a hormone in a biochemical pathway|
|5.||information in response to an inquiry, experiment, etc: there was little feedback from our questionnaire|
|6.||(tr) to return (part of the output of a system) to its input|
|7.||to offer or suggest (information, ideas, etc) in reaction to an inquiry, experiment, etc|
feedback feed·back (fēd'bāk')
The return of a portion of the output of a process or system to the input, especially when used to maintain performance or to control a system or process.
The portion of the output so returned.
The return of information about the result of a process or activity.
negative feedback n.
Feedback that reduces the output of a system.
Feedback in which the output quantity or signal lowers the input quantity or signal. Negative feedback is used in natural and artificial regulatory mechanisms, as well as in the design of oscillators.
A process in which a system regulates itself by monitoring its own output. That is, it “feeds back” part of its output to itself. Feedback is used to control machines; a heating system, for example, uses a thermostat to monitor and adjust its output. Feedback is also used by the human brain to control various muscles and joints.
Note: By extension, “feedback” is any response or information about the result of a process.
Note: Feedback is usually a feature of automation.